Okay, I wanna try, bc some of these make me laugh.
Things I did before I realized I was nonbinary:
Always felt like my name didn't fit. And once a kid gave me a nickname like randomly, and it MADE MY DAY (i still think about it)
On the same note regularly thought about what I would change my name too if I could
Cut my hair short for the first time (like pixie cut) and had a nightmare about getting long hair. These continue every time my hair starts to grow out
KNEW that having a chest made me uncomfortable, and anxious. Completely ignored that
Tried to get out of always wearing dresses since I was 11
Would get REALLY happy when people confused me for a guy
The "well i wouldn't mind being anything other then a girl, but i mean, i was born a girl so..."
DEEPLY connected to Reflection from Mulan
Would as a kid, GENUINELY get hit with, "oh yeah, im a girl. Weird."
Continuing off that, I have a relative who's nonbinary, and when they came out, I remembered how I also thought that about them as a kid. Did not interrogate why I also thought that about me.
As a kid, there were some characters that my brain just didnt accept were boys of girls. Specifically, Peso from octonauts, and Tails from sonic. They were my favorites.
I didnt have a "not like other girls" phase, but in the, like, 6th grade, I was TERRIFIED of being one of those. Because to an extent I fit the model. (Just not really being into a lot of femme things my peers were into. But i felt like the only way to express that came off very pick me.)
Took the "whats my gender" quizzes, but bc I wasn't ready to fully introspect picked the girl options. Felt unsatisfied each time.